When I get tired of doing that I usually play acoustic.
Mostly soft, mellow music, like... uhm I think its
Jimmy Page, anyaway the song is called "going to california". That kinda sound.
ooh Eric Claptons "Signe" is also real nice. bossanova stuff too. or spanish guitar. or classical.
I dont like to play songs or heavy riffs when I play alone. It sounds so empty without drums, bass, and song.